package com.heima.kafka.sample;

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;

import java.time.Duration;
import java.util.Collections;
import java.util.Properties;

/**
 * @author 谢金成
 * @date 2024/4/12 11:45
 */
public class ConsumerQuickStart {

    public static void main(String[] args) {
        // 1.设置kafka的配置信息
        Properties properties = new Properties();
        // 链接地址
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "10.0.0.2:9092");
        // 消费者组
        properties.put(ConsumerConfig.GROUP_ID_CONFIG, "group1");
        // 序列化器
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        // 2.创建消费者对象
        KafkaConsumer<String, String> consumer = new KafkaConsumer<>(properties);
        // 3.订阅主题
        consumer.subscribe(Collections.singletonList("itcast-topic-out"));
        // 4.获取信息
        while (true) {
            ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
            for (ConsumerRecord<String, String> consumerRecord:
                    consumerRecords) {
                System.out.println(consumerRecord.key());
                System.out.println(consumerRecord.value());
            }
        }
    }
}
